Date: 12 October 2015
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AUSCERT External Security Bulletin Redistribution
Cisco Unified Communications Manager IM and Presence Service
REST API Denial of Service Vulnerability
12 October 2015
AusCERT Security Bulletin Summary
Product: Cisco Unified Communications Manager
Publisher: Cisco Systems
Operating System: Cisco
VMware ESX Server
Impact/Access: Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2015-6310
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Cisco Unified Communications Manager IM and Presence Service REST API Denial
of Service Vulnerability
Threat Type: CWE-399: Resource Management Errors
IntelliShield ID: 41242
First Published: 2015 October 02 14:26 GMT
Last Published: 2015 October 02 14:26 GMT
Port: Not available
Urgency: Unlikely Use
Severity: Mild Damage
CVSS Base: 5.0
CVSS Version 2.0
Version Summary: Cisco Unified Communications Manager IM and Presence Service
contains a vulnerability that could allow an unauthenticated, remote attacker
to cause a denial of service condition. Updates are not available.
A vulnerability in the Representational State Transfer (REST) interface of the
Cisco Unified Communications Manager IM and Presence Service could allow an
unauthenticated, remote attacker to cause a partial denial of service (DoS)
condition because the Cisco Session Initiation Protocol (SIP) proxy service
can unexpectedly restart.
The vulnerability is due to lack of proper input validation of the HTTP
request when it is sent to the REST interface. An attacker could exploit this
vulnerability by sending a crafted HTTP request to the REST interface of the
affected application. An exploit could allow the attacker to cause a partial
DoS condition because the Cisco SIP proxy service can unexpectedly restart.
Cisco has confirmed the vulnerability; however, software updates are not
At the time this alert was first published, Cisco Unified Communications
Manager IM and Presence Service release 11.5(1) was vulnerable. Later releases
may also be vulnerable.
To exploit the vulnerability, an unauthenticated attacker must reach the REST
interface and send a crafted HTTP request to the device. This requirement may
reduce the likelihood of a successful exploit.
Cisco indicates through the CVSS score that functional exploit code exists;
however, the code is not known to be publicly available.
Cisco has released bug ID CSCuw31632 for registered users, which contains
additional details and an up-to-date list of affected product versions.
An unauthenticated, remote attacker could exploit this vulnerability to cause
the Cisco SIP proxy service to stop functioning, resulting in a DoS condition.
The vulnerability is due to improper input validation of the HTTP request sent
to the REST interface.
An unauthenticated, remote attacker could exploit this vulnerability by
sending a crafted HTTP request to the targeted device. A successful exploit
could cause the Cisco SIP proxy service to restart, resulting in a DoS
Administrators are advised to contact the vendor regarding future updates and
Administrators are advised to allow only trusted users to have network access.
Administrators are advised to allow only privileged users to access
administration or management systems.
Administrators are advised to monitor affected systems.
Software updates are not available.
The security vulnerability applies to the following combinations of products.
Cisco Cisco Unified Communications Manager IM and Presence Service 11.5 (1)
The urgency and severity ratings of this alert are not tailored to individual
users; users may value alerts differently based upon their network
configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED
THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF
GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED
THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION
IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE
TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES
THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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